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Why someone is dizzy after doing a maximum lift exercise

What would cause a client to say to me after he completes a maximum lift standing press to say, " I feel slightly dizzy and see spots before my eyes."

I am assuming that there is a physiological explanation for this? (I am thinking that there is a lack of blood to the brain.)

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You are quite right about your conclusion of the phenomenon existing because of decreased blood to the brain. While straining to do a maximal lift people do what is called the Valsalva maneuver.
<br>By definition this is: forced expiration attempt against a closed glottis (ie. keeping nose and mouth ...